/Engine/Source/Editor/StaticMeshEditor/Public/StaticMeshEditorSubsystem.h
Gets the material slot used for a specific LOD section.
MaterialSlotIndexIndexof the material slot used by the section or INDEX_NONE in case of error.
int32 GetLODMaterialSlot ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, int32 LODIndex, int32 SectionIndex )